linux-kernel - Re: [PATCH v3 0/3] PCI: mt7621: Add MediaTek MT7621 PCIe host controller driver

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Date:   Thu, 21 Oct 2021 21:23:35 +0200
From:   Sergio Paracuellos <sergio.paracuellos@...il.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-pci <linux-pci@...r.kernel.org>,
        "open list:MIPS" <linux-mips@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        John Crispin <john@...ozen.org>, NeilBrown <neil@...wn.name>,
        Greg KH <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v3 0/3] PCI: mt7621: Add MediaTek MT7621 PCIe host
 controller driver

On Thu, Oct 21, 2021 at 8:11 PM Bjorn Helgaas <helgaas@...nel.org> wrote:
>
> On Thu, Oct 21, 2021 at 07:27:21PM +0200, Sergio Paracuellos wrote:
> > On Thu, Oct 21, 2021 at 5:52 PM Bjorn Helgaas <helgaas@...nel.org> wrote:
> > > Since this is a PCIe (not conventional PCI) controller, I vote for
> > > renaming these from:
> > >
> > >   PCI_MT7621
> > >   Documentation/devicetree/bindings/pci/mediatek,mt7621-pci.yaml
> > >   drivers/pci/controller/pci-mt7621.c
> > >
> > > to:
> > >
> > >   PCIE_MT7621
> > >   Documentation/devicetree/bindings/pci/mediatek,mt7621-pcie.yaml
> > >   drivers/pci/controller/pcie-mt7621.c
> > >
> > > We have a mix of these, with many of the early PCIe drivers being
> > > named "pci", but I think that was my mistake and there's no reason to
> > > continue it.
> >
> > I see.
> >
> > >
> > > I can do this locally unless somebody objects.
> >
> > I have no problem at all. Only one question. Do you mean to change
> > compatible string also, or only the name of the file? Let me know if I
> > have to do anything.
>
> I didn't change the compatible string, to avoid a DT incompatibility.
> But I *did* change the Kconfig symbol to PCIE_MT7621, which could
> require changes to out-of-tree .configs.  I'm open to suggestions
> either way for both things.

IMHO, I do think we should not worry about out-of-tree stuff at all.
If the correct way to define the Kconfig symbol or the compatible
string is to change them, just do that. MT7621 SoC is extensively used
by openWRT community. As far as I have seen until now, the way of
doing things there is to take the latest long term kernel (now they
are using 5.4 as stable and 5.10 as testing kernel), apply a bunch of
patches they have and do a complete build of both kernel, device tree
and rootfs. So I guess it is not a big problem if we also change
compatible string since when an update is performed for a device all
of the stuff is just replaced. Maybe I am wrong and John has a
different opinion... John, any comments on this?

Best regards,
    Sergio Paracuellos